[Opensim-users] lsl differences for vehicles on bulletsim vs ODE engines

[Dr Ramesh Ramloll]

Thanks Mister for your very helpful pointer. I can now proceed more
confidently.
R

On Sat, Mar 2, 2013 at 4:17 PM, Mister Blue <misterblue at misterblue.com>wrote:

> Depends on your preferences. One advantage with starting with ODE scripts
> is they already have adapted to OpenSim[1]. Other than that, there is
> something to be learned from any of the scripts.
>
> -- mb
>
> [1] Like, several SL vehicle scripts rely on a timer to set velocity and
> angle but OpenSim's default minimum timer interval is 0.5 seconds which is
> way too large for controlling vehicles.
>
>
>
> On Sat, Mar 2, 2013 at 8:27 AM, Dr Ramesh Ramloll <r.ramloll at gmail.com>wrote:
>
>> Thanks for replying Mister. If I understand correct, I might be better
>> off starting with an ODE vehicle code and evolve it so that it works on
>> BulletSim, rather than starting with an SL vehicle code and try to make it
>> work on BulletSim. The path from ODE vehicle to BulletSim vehicle is
>> shorter than the path from SL vehicle code to BulletSim code. Let me know
>> If my understanding is correct. With scaling of parameters differing etc..
>> and not knowing what these differences are, I think it will be difficult
>> for me to debug based on visible behavior alone (possible but am not the
>> sharpest tool in the box).
>>
>>
>> On Sat, Mar 2, 2013 at 12:59 AM, Mister Blue <misterblue at misterblue.com>wrote:
>>
>>> [[Full disclosure... I'm the author of BulletSim. :-) ]]
>>> The LSL commands for the vehicles are the same for both ODE and
>>> BulletSim -- that is, they implement the LSL functions and simple vehicle
>>> model defined in SL[1]. That said, which functions are actually implemented
>>> differ and the scaling of parameters differ.
>>>
>>> BulletSim has been working at calibrating its actions to be similar to
>>> SL. ODE had some differences from SL and thus vehicle scripts that worked
>>> in SL didn't work the same with ODE[2]. BulletSim is trying to change that.
>>> The os function osGetPhysicsEngineType() was added to help script writers
>>> if they wanted to have vehicles that worked with either physics engine.
>>>
>>> The current BulletSim vehicle functions is being tracked at
>>> http://opensimulator.org/wiki/BulletSim/Functionality/.
>>>
>>> BulletSim is under active development and, if there are vehicles
>>> functions that are wrong or need different tuning, send me a note.
>>>
>>> -- mb
>>>
>>> [1] http://wiki.secondlife.com/wiki/Linden_Vehicle_Tutorial
>>> [2] For instance, turning force in ODE is about 10 times smaller than in
>>> SL so a reasonable turning value for SL would barely turn a vehicle under
>>> ODE.
>>>
>>>
>>>
>>> On Wed, Feb 27, 2013 at 6:38 AM, Dr Ramesh Ramloll <r.ramloll at gmail.com>wrote:
>>>
>>>> Hello,
>>>> I was thinking that before I invest too much time in vehicles, I should
>>>> learn from the community about lsl differences for vehicle control on the
>>>> two different engines, bulletsim vs ODE.
>>>> Is it perhaps better to wait for Bulletsim to get the green light
>>>> before investing time in vehicle coding?
>>>> Thanks
>>>> R
>>>>
>>>> --
>>>> 'Consider how the lilies grow. They do not labor or spin.'
>>>> *Rameshsharma Ramloll* PhD, CEO CTO DeepSemaphore LLC, Affiliate *Research
>>>> Associate Professor*, Idaho State University, Pocatello, ID 83209 Tel:
>>>> 208-240-0040
>>>> Blog <http://deepsemaphore.posterous.com/>, LinkedIn<http://www.linkedin.com/in/rameshramloll>
>>>> , DeepSemaphore LLC <http://www.deepsemaphore.com>, Google+ profile<https://plus.google.com/103652369558830540272/about>
>>>>
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>>>
>>>
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>>
>>
>>
>> --
>> 'Consider how the lilies grow. They do not labor or spin.'
>> *Rameshsharma Ramloll* PhD, CEO CTO DeepSemaphore LLC, Affiliate *Research
>> Associate Professor*, Idaho State University, Pocatello, ID 83209 Tel:
>> 208-240-0040
>> Blog <http://deepsemaphore.posterous.com/>, LinkedIn<http://www.linkedin.com/in/rameshramloll>
>> , DeepSemaphore LLC <http://www.deepsemaphore.com>, Google+ profile<https://plus.google.com/103652369558830540272/about>
>>
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>
>
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-- 
'Consider how the lilies grow. They do not labor or spin.'
*Rameshsharma Ramloll* PhD, CEO CTO DeepSemaphore LLC, Affiliate *Research
Associate Professor*, Idaho State University, Pocatello, ID 83209 Tel:
208-240-0040
Blog <http://deepsemaphore.posterous.com/>,
LinkedIn<http://www.linkedin.com/in/rameshramloll>
, DeepSemaphore LLC <http://www.deepsemaphore.com>, Google+
profile<https://plus.google.com/103652369558830540272/about>
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